ATLANTA, Georgia (CNN) -- A suspect was arrested Wednesday in connection with the fatal shootings of two off-duty DeKalb County police officers earlier in the day, and other arrests were expected, authorities said.

DeKalb County, Georgia, Police Chief Terrell Bolton shows photos of his men who were killed Wednesday.

Herbie Deshawn Durham, 32, was being held on suspicion of two counts of murder, and police were still seeking multiple suspects in the case, DeKalb County Police Department spokesman Mekka Parish told CNN.

Police Chief Terrell Bolton appealed to the public for assistance in the case earlier Wednesday, vowing, "we're going to hunt them down to make sure that justice is served."

The slain officers were identified as Ricky Bryant Jr., 26, and Eric Barker, 33, both of whom were married with four children.

"Hearing the screams of the widows that are without husbands now is a sound you never want to hear," Bolton said. "This is a must-solve crime." Watch Bolton describe the killings »

Then, in comments directed to anyone who might have information about the killings, he said, "Don't lie to us. Tell us the truth."

He urged any witnesses who might be afraid to call police to call the news media instead. "Call the free press; trust them to do the right thing with the information."

Barker, an Army reservist who served in Afghanistan, had been a policeman for four years; Bryant, for two.

The uniformed officers had spent the day on regular duty and were moonlighting by providing overnight security at the Glenwood Gardens apartments in suburban Atlanta, Bolton said. Shortly before 1 a.m. Wednesday, as they were responding to a call about a suspicious person, someone fired at them, he said. "They never had a chance."

One officer died at the scene. The other died at a hospital.

Bolton said that police were seeking at least two suspects in the case, and that witnesses had provided information to police.

He said his officers had been called to the apartments before, but larger societal issues played a role in the tragedy.

"If you ain't got health insurance, if you don't have jobs, if you're in a cycle of poverty where all you know is to do what you do, this is what we end up with," he said.

Various agencies have offered their support. A reward totaling $60,000 was offered for information leading to an arrest and conviction, Parish said.E-mail to a friend